| ( | 120 | + | x | ) | × | 2251 2500 | = | 451 250 | x |
| 方程左边 = | 120 | × | 2251 2500 | + | x | × | 2251 2500 |
| = | 13506 125 | + | x | × | 2251 2500 |
13506 125 | + | 2251 2500 | x | = | 451 250 | x |
2251 2500 | x | − | 451 250 | x | = | - | 13506 125 |
| - | 2259 2500 | x | = | - | 13506 125 |
13506 125 | = | 2259 2500 | x |
2259 2500 | x | = | 13506 125 |
| x | = | 13506 125 | ÷ | 2259 2500 |
| = | 13506 125 | × | 2500 2259 |
| = | 4502 | × | 20 753 |
| x | = | 90040 753 |
| x | = | 119.575033 |